Can't zoom in or move around
Depending on the situation, which is sadly not possible to see here (it could help if you attach a picture of your view), i would recommend to press Numpad Decimal or go in the "View" Menu and click on "Frame Selected".

If you zoom in enough on a small detail, the amount of movement with the mouse seems to get drastically reduced.

Once you use "Frame Selected" Numpad Decimal or even "Frame all" with Home, you should have a normal responsiveness of your mouse navigation in the 3D Viewport.